Actor(s): APT37
There is no description at this point.
rule win_starcruft_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.starcruft." info = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.6.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.starcruft" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { 8b08 83c108 51 e8???????? 83c40c 6a00 8d55f0 } // n = 7, score = 100 // 8b08 | mov ecx, dword ptr [eax] // 83c108 | add ecx, 8 // 51 | push ecx // e8???????? | // 83c40c | add esp, 0xc // 6a00 | push 0 // 8d55f0 | lea edx, [ebp - 0x10] $sequence_1 = { 837dfcff 7502 eb6b c785d0fdffff24020000 8d85d0fdffff 50 8b4dfc } // n = 7, score = 100 // 837dfcff | cmp dword ptr [ebp - 4], -1 // 7502 | jne 4 // eb6b | jmp 0x6d // c785d0fdffff24020000 | mov dword ptr [ebp - 0x230], 0x224 // 8d85d0fdffff | lea eax, [ebp - 0x230] // 50 | push eax // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_2 = { 8b4508 50 ff15???????? 83c001 50 8b4d08 } // n = 6, score = 100 // 8b4508 | mov eax, dword ptr [ebp + 8] // 50 | push eax // ff15???????? | // 83c001 | add eax, 1 // 50 | push eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_3 = { 8945fc 8d45e0 50 ff15???????? 8b0d???????? 0fb75108 52 } // n = 7, score = 100 // 8945fc | mov dword ptr [ebp - 4], eax // 8d45e0 | lea eax, [ebp - 0x20] // 50 | push eax // ff15???????? | // 8b0d???????? | // 0fb75108 | movzx edx, word ptr [ecx + 8] // 52 | push edx $sequence_4 = { 8b4df4 c1e104 8b55f4 c1ea1c 0bca 034dfc 894df4 } // n = 7, score = 100 // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // c1e104 | shl ecx, 4 // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // c1ea1c | shr edx, 0x1c // 0bca | or ecx, edx // 034dfc | add ecx, dword ptr [ebp - 4] // 894df4 | mov dword ptr [ebp - 0xc], ecx $sequence_5 = { ff15???????? 8b8da8fdffff 51 e8???????? 83c404 b801000000 8b4df8 } // n = 7, score = 100 // ff15???????? | // 8b8da8fdffff | mov ecx, dword ptr [ebp - 0x258] // 51 | push ecx // e8???????? | // 83c404 | add esp, 4 // b801000000 | mov eax, 1 // 8b4df8 | mov ecx, dword ptr [ebp - 8] $sequence_6 = { c7000c000000 8b4d0c 8b11 52 e8???????? 83c404 } // n = 6, score = 100 // c7000c000000 | mov dword ptr [eax], 0xc // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 8b11 | mov edx, dword ptr [ecx] // 52 | push edx // e8???????? | // 83c404 | add esp, 4 $sequence_7 = { 334dfc 234df0 334dfc 034db8 8b55f8 8d840adb702024 8945f8 } // n = 7, score = 100 // 334dfc | xor ecx, dword ptr [ebp - 4] // 234df0 | and ecx, dword ptr [ebp - 0x10] // 334dfc | xor ecx, dword ptr [ebp - 4] // 034db8 | add ecx, dword ptr [ebp - 0x48] // 8b55f8 | mov edx, dword ptr [ebp - 8] // 8d840adb702024 | lea eax, [edx + ecx + 0x242070db] // 8945f8 | mov dword ptr [ebp - 8], eax $sequence_8 = { 51 ff15???????? 8d95a0edffff 52 8d85b0f2ffff 50 } // n = 6, score = 100 // 51 | push ecx // ff15???????? | // 8d95a0edffff | lea edx, [ebp - 0x1260] // 52 | push edx // 8d85b0f2ffff | lea eax, [ebp - 0xd50] // 50 | push eax $sequence_9 = { 894df8 8b55f8 0fb702 85c0 7415 8b4df8 0fb711 } // n = 7, score = 100 // 894df8 | mov dword ptr [ebp - 8], ecx // 8b55f8 | mov edx, dword ptr [ebp - 8] // 0fb702 | movzx eax, word ptr [edx] // 85c0 | test eax, eax // 7415 | je 0x17 // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 0fb711 | movzx edx, word ptr [ecx] condition: 7 of them and filesize < 294912 }
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